"Array deduplication" is a commonly used operation in practical applications, and the probability of appearing in interview questions is also very high. Today I will briefly describe the method of array deduplication in Python and JavaScript. I hope it can help everyone.
>>> a = [9,8,7,9,7,1,2,1,2,5,3] >>> new_a = list(set(a)) >>> new_a [1, 2, 3, 5, 7, 8, 9] #此时new_a未保持原有的顺序，对new_a进行排序 >>> new_a.sort(key = a.index) >>> new_a [9, 8, 7, 1, 2, 5, 3]
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script type="text/javascript">
var array1 = [1,2,6,8,4,2,3,9,47,1,2,23,5,8,3];
var result = [];
for (var i = 0; i < array1.length; i++)
{
if (array1.indexOf(array1[i])==i) //如过该元素在数组中第一次出现的位置 == 该元素当前的位置【A】
{
result.push(array1[i]);//将符合【A】条件的元素加入到result中
}
}
alert(result);
</script>
</head>
<body>
</body>
</html>
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